mirror of https://github.com/poanetwork/quorum.git
72 lines
1.2 KiB
Go
72 lines
1.2 KiB
Go
package vm
|
|
|
|
import (
|
|
"fmt"
|
|
"math/big"
|
|
)
|
|
|
|
func newStack() *Stack {
|
|
return &Stack{}
|
|
}
|
|
|
|
type Stack struct {
|
|
data []*big.Int
|
|
ptr int
|
|
}
|
|
|
|
func (st *Stack) Data() []*big.Int {
|
|
return st.data
|
|
}
|
|
|
|
func (st *Stack) push(d *big.Int) {
|
|
// NOTE push limit (1024) is checked in baseCheck
|
|
stackItem := new(big.Int).Set(d)
|
|
if len(st.data) > st.ptr {
|
|
st.data[st.ptr] = stackItem
|
|
} else {
|
|
st.data = append(st.data, stackItem)
|
|
}
|
|
st.ptr++
|
|
}
|
|
|
|
func (st *Stack) pop() (ret *big.Int) {
|
|
st.ptr--
|
|
ret = st.data[st.ptr]
|
|
return
|
|
}
|
|
|
|
func (st *Stack) len() int {
|
|
return st.ptr
|
|
}
|
|
|
|
func (st *Stack) swap(n int) {
|
|
st.data[st.len()-n], st.data[st.len()-1] = st.data[st.len()-1], st.data[st.len()-n]
|
|
}
|
|
|
|
func (st *Stack) dup(n int) {
|
|
st.push(st.data[st.len()-n])
|
|
}
|
|
|
|
func (st *Stack) peek() *big.Int {
|
|
return st.data[st.len()-1]
|
|
}
|
|
|
|
func (st *Stack) require(n int) error {
|
|
if st.len() < n {
|
|
return fmt.Errorf("stack underflow (%d <=> %d)", len(st.data), n)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (st *Stack) Print() {
|
|
fmt.Println("### stack ###")
|
|
if len(st.data) > 0 {
|
|
for i, val := range st.data {
|
|
fmt.Printf("%-3d %v\n", i, val)
|
|
}
|
|
} else {
|
|
fmt.Println("-- empty --")
|
|
}
|
|
fmt.Println("#############")
|
|
}
|